Greenlee GSB01 1/2" Step Bit, 13-Stage Multi-Hole Drill Bit

Greenlee GSB01 1/2" Step Bit, 13-Stage Multi-Hole Drill Bit

The Greenlee GSB01 1/2" Step Bit is a 13-stage multi-hole drill bit engineered to cut mild steel, aluminum, brass, copper, wood, fiberglass, plastics, and laminates with a single tool. Featuring a patented split-step design and an improved double flute geometry, this step bit delivers a minimum drill diameter of 1/8" (3.2 mm) up to a maximum drill diameter of 1/2" (12.7 mm), making it a versatile choice for electricians, HVAC technicians, and metal fabricators. It is rated for sheet metal thickness up to 10 gauge (3.5 mm), and it replaces the legacy Greenlee 34401 step bit in the lineup.

Key Features

• Drill Range: Steps from a 1/8" (3.2 mm) minimum diameter to a 1/2" (12.7 mm) maximum diameter across 13 individual drill stages, covering a wide range of hole sizes with one bit.
• Improved Double Flute Design: Provides superior chip evacuation, faster cutting speeds, and extended tool life compared to earlier designs.
• Patented Split-Step Design: Optimizes chip load for fast, smooth cutting action and more holes per battery charge on cordless drills.
• Durable Split-Point Tip: Enables fast, accurate material penetration and reduces walking when starting a hole.
• Progressive Cutting Edges: Deliver balanced aggression that maximizes torque efficiency and minimizes stalling during operation.
• Three-Flat Shank: Compatible with all 1/2" drill chucks for secure, slip-resistant holding in standard drills and drivers.
• Laser Markings: Clearly identify product and hole size at each step for quick, accurate reference on the job.
• Sheet Metal Capacity: Rated for use on material up to 10 gauge (3.5 mm) thick.

Technical Specifications

• Country of Origin: United States
• Type: Multi-hole Step Bit
• Number of Drill Stages: 13
• Minimum Drill Diameter: 1/8" (3.2 mm)
• Maximum Sheet Metal Thickness: 10 gauge (3.5 mm)
• Maximum Drill Diameter: 1/2" (12.7 mm)

Typical Applications

• Electrical Panel and Enclosure Fabrication
• HVAC Ductwork and Sheet Metal Work
• General Metal, Wood, and Plastic Fabrication
• Drilling Mild Steel, Aluminum, Brass, and Copper
• Cutting Fiberglass and Laminate Materials

Why Greenlee?

Greenlee engineers the GSB01 step bit with a patented split-step design, progressive cutting edges, and a durable split-point tip to deliver consistent, accurate holes across a wide range of materials. The three-flat shank and laser-etched size markings make this bit easy to identify and use across job sites, while its improved double flute geometry extends tool life and cutting performance for demanding professional trade work.